Google sent out notification to its AdWords advertisers that this month “your location-specific business phone number will display alongside your destination url in ads that appear on high-end mobile devices. Users will be able to click-to-call your business just as easily as they click to visit your website. You’ll be charged for clicks to call, same as you are for clicks to visit your website.”

Note that this offer doesn’t appear to be specific to phones running Google’s (GOOG) Android operating system. And it appears to be running in addition to Google’s practice of providing phone numbers in organic search results, which also essentially provide “click to call” options for smartphone users.

In Sterling’s words: “This is a version, effectively, of “pay-per-phone call” but the cost per call is the same as a click–a bargain (generally speaking) for the advertisers to receive a ‘warm lead.’”

Google first started playing around with “click to call” programs for conventional Web search four years ago. In that scenario, you gave Google your phone number (this was designed for landline use, really), and it connected calls to advertisers on your behalf.

Google eventually moved on, since no one seemed to use this option (though you can still see traces of the program here). But connecting mobile users with advertisers ought to be a very lucrative proposition, so no surprise that Google is still chasing after this.

I think the NSA has a job to do and we need the NSA. But as (physicist) Robert Oppenheimer said, “When you see something that is technically sweet, you go ahead and do it and argue about what to do about it only after you’ve had your technical success. That is the way it was with the atomic bomb.”

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